Former psychiatrist, Frank Clevenger, is tapped by the FBI to catch an elusive murderer known as the "Highway Killer", who has left twelve bodies strewn across twelve states. Clevenger reluctantly accepts the case, but what he and the authorities cannot know is that the Highway Killer isn't just a serial killer - he is also a psychiatrist, whose brilliance as a gifted doctor is matched only by his precision as a murderer. When he writes to a national newspaper challenging Clevenger to cure him through an exchange of open letters, a gripping public therapy unfolds. But as the Highway Killer confronts the demons that inhabit his own tortured mind, his brutality climbs to new heights. Will Clevenger be able to exorcise those demons before they spin completely out of control?